TPBi, or 2,2',2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (CAS 192198-85-9), is an electron-deficient benzimidazole derivative widely chosen as an electron transport layer (ETL) material in optoelectronic devices. Product code M651 is the sublimed grade with purity above 99.5%, supplied as a white powder.
Its low LUMO level of 2.7 eV makes TPBi suitable as a host for both fluorescent and phosphorescent emitters, while its very deep HOMO level (6.2/6.7 eV) gives it strong hole blocking ability. Because it combines electron transport and hole blocking, TPBi can stand in for a CBP hole blocking layer plus an Alq3 electron transport layer, simplifying the device stack.
TPBi has also been reported as a thin electron injection interlayer between Alq3 and a Cs2O3/Al electrode, where it assists electron injection and contributes to hole blocking and exciton confinement. Sublimation is used to reach this ultra-pure grade for demanding thin-film device work.
- Electron transport layer in OLEDs and other optoelectronic devices.
- Hole blocking layer exploiting its deep HOMO energy level.
- Host material for fluorescent and phosphorescent light-emitting layers.
- Electron injection interlayer at the cathode interface of OLEDs.
- Charge transport layer in perovskite light-emitting diodes.
- Research on organic electronics including FETs, LEDs and PVs.
| Brand | Ossila |
|---|---|
| CAS number | 192198-85-9 |
| Molecular formula | C45H30N6 |
| Purity | Sublimed >99.5% |
| Category | — |
| Pack sizes | 250 mg, 500 mg, 1 g |
| Physical form | White Powder |
| Storage | — |
- Product code: M651
- Molecular weight: 654.76 g/mol
- Absorption: λmax 305 nm in THF
- Fluorescence: λem 370 nm in THF
- HOMO/LUMO: HOMO 6.2/6.7 eV, LUMO 2.7 eV
- Melting point: 272 - 277 °C (lit.)
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